Verb + 不 + 完
Reach for this when there's too much of something to finish — too much food to eat, too many books to read, too much work to do. The 不 sits between the verb and 完 to say the action CAN'T reach completion, usually because the amount is overwhelming. It's a potential complement, not a simple negative: you're not saying 'didn't finish' but 'can't possibly finish.' Use it for emphasis on quantity, not for things you simply chose not to do.
Structure
[VERB] + 不 + 完 + [OBJECT]
[VERB] bù wán
How to Think About It
The 不 here is squeezed between verb and 完 to mean 'unable to.' Compare with 没…完 ('didn't finish' — past, just a fact) and …完了 ('finished' — done). 吃不完 is forward-looking and emphatic: there's just too much. The positive version is 吃得完 ('can finish'), with 得 in the same slot.
Examples
饭太多了, 我吃不完。
Fàn tài duō le, wǒ chī bù wán.
There's too much food, I can't finish it.
今天的作业太多, 我做不完。
Jīntiān de zuòyè tài duō, wǒ zuò bù wán.
Today's homework is too much, I can't finish it.
图书馆的书一辈子也看不完。
Túshūguǎn de shū yībèizi yě kàn bù wán.
Even in a lifetime, you couldn't read all the books in the library.
Common Mistake
Learners say 不吃完 thinking it negates 吃完, but 不 in front of the verb means 'won't' (a choice), not 'can't.' The negative potential complement requires 不 to sit between verb and 完.
饭太多了, 我不吃完。
饭太多了, 我吃不完。
Don't Confuse With
Verb + 得 + 完
The positive potential complement ('can finish'). 吃得完 = able to finish. Flip 得 to 不 for the negative.
没 + Verb + 完
Simple past negation: 'didn't finish.' States a fact about a specific occasion. 吃不完 is about capacity, not history.
Verb + 不了
More general 'can't do' (can't go, can't eat). 不完 specifically says 'can't bring to completion because there's too much.'
Practice
饭太多了, 我吃____完。
Show answer
不
今天的作业太多, 我做不____。
Show answer
完
Arrange: 一辈子 / 看 / 也 / 不完 / 图书馆 / 的书
Show answer
图书馆的书一辈子也看不完。
Many people can't finish their meal.
Show answer
很多人吃不完饭菜。
Write a sentence using V不完 about something there's too much of.
Show answer
中国的好吃的东西多得一年也尝不完。
Hear It in Real Episodes
This pattern appears in 1 Fluentide episode: